Stephen d



(No Model?) S. D. FIELD.

, PRINTING TELEGRAPH. No. 279,865. Patented June 19,1883.

WITNESSES INVENI'OR @153. Jhwr v A/ 2. 51444 WA /Maw BY Z W ATTORNEYS.

ETERS. Phommha n hnr. Wnhingom n. c,

UNITED STATES PATENT OFFICE.

STEPHEN D. FIELD, OF NEYV YORK, Y Y.

PRINTING-TELEGRAPH.

SPECIFICATION forming-part of Letters Patent No. 279,865, dated June 19, 1883. Application filed February 24, 1883. (No model.)

To all whom it may concern: 1

Be it known that I, STEPHEN D. FIELD, of New York, in the county of New York and State of New York, have invented a new and useful Improvement in PrintingTelegraphs; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawing, and to the letters of reference marked thereon.

My invention relates to that class of print ing-telegraphs known ordinarily as step-bystep printers and its object isto furnish therefor a simple and reliable unison devicethat is, a device by the use of which the oper= ator transmitting news may at anytime look all the printing-wheels in the. circuit at a certain fixed and predetermined point, termed the unison-point, and then release them therefrom for operation. y

In carrying myinvention into effect I make use of the ordinary eseapement, printing wheel or wheels actuated or controlled thereby, inking devices, and paper-feed; hence they need not be particularly described. The printing is accomplished upon the breaking of a normally-charged printing-circuit, the printingmagnet then rel easing the printing-lever, which is thrown against the'type-wheel by its retractile spring. A second magnet or unison-magnet is interposed 'in this normally charged printingcircuit, having an armature -lever whose non-armature end is carried by a spring, when the circuit is broken, into the path of a stop or arm on the type-wheel or in the typewheel train, so as to stop the type-wheel at the certain predetermined point. From this it is evident that whenever the printing-circuit is broken to print, the spring tends to immediately put the unison into action. To prevent this, and permit the calling into action of the unison only when desired, an arm is placed upon the printing-l ever, taking under the unison-lever in such way as to throw it away from the unison-stop whenever the printing-lever is thrown into posit-ion to print. As thus arranged, the unison is prevented from acting, first, by its magnet in the normally-charged printing-circuit; secondly, by the action on it of the arm on the printing-lever -when the printing circuit is broken. It is necessary, therefore, to demagnetize the unison-magnet without affecting the printing-circuit. To do this the free end of the eseapement-armature is caused to play between contact-points which form one terminal of a shunteircnit around the unison-magnet, while the other terminal is carried to the lever itself. hen the es capement-lever is at work, the contacts are so brief that this shunt is not closed sufliciently long to demagnetize the unison-magnet; but when the escapement-lever is-brought to rest, it remains in contact, closing the shunt and causing the demagnetization of the unisonmagnet, whose lever falls away therefrom and is carried by its spring into position for action. The unison lever and its spring are so adjusted that when once the lever has been released the force of its magnet is not suflicient to re store its position, so that after the stoppage of the escapement to form the shunt throwing the unison into action, the escapelnent may be operated to bring the type-wheel to unison withoutqlanger of causing a release of .the uni son, which latter is then. done by throwing the printing-lever into action, which then lifts the unison-lever from the unison-stop, placing its armature in such nearness to the unison-magnet that the latter may again attract and hold it. This is ill ustrated in the drawing, in which these co-operating parts and circuits only are shown, the framing, paper-feed, inking-rollers,

&e., being omitted therefromin order that the actual features of the invention may be more clearly and prominently shown.

A A arethe escapeinent-magnets, between which plays the escapement-lever B, carrying anchor l, controlling escape-wheel D on the sh aft S of the type-wheel E. (Indicated in dotted lines.) 1 1 in, full lines is the cscapement or type-wheel circuit.

H is the printingmagnet in the circuit 2 2, (shown in heavy dotted lines,) and kept normally charged, so as to hold its arn'iature-lever G, carrying platen F, away from the type wheel and against the resilience of a spring or other retraetor, I). son-magnet I, having armature-lever K, pivoted at e, and provided with an adjustable retractor, d. The non-armature end of this lever is arranged to take, when d is allowed to act upon it, in the path of an arin or stop, 0, which may be called the unison-stop, fixed upon thetypewh eel shaft, ash ere shown, or upon the In this circuit2 2 is the uni IOO type-wheel or upon some member of the typewheel train. The force of d and the distance to which the armature may move away from I are so adjusted relatively to the force of I that whenever K is released from I, Ihas not magnetic force enough to unaided again bring K back.

Upon the printing-lever G- is mounted an arm, 9, taking under K, so as to throw the stop end of'K upward whenever G is raised to print.

The free end of the escapcmentlever B plays between contact-points M, from which a wire, 3, leads to a point, 00, in the circuit 2, while from the lever a wire, 4, leads to a point, y, in the same circuit, the contact-points, escape- 1n.ent1-lev'cr, and wires 3 4: forming a shunt to I. (Shown. in light dotted lines.)

The operation of these devices is as follows: The circuit 2 2 is kept normally charged, so that G and K are attracted and held from ac tion by their respective magnets. IVhile the escapement CD is in operation to set thetype wheel or wheels the contacts between B aiidii are so brief that the shunt 3 4; does not affect I. "If, however, the escapement be stopped, B rests in contact with one of the pivots, t, and I becomes demagnetized, allowing spring (I to pull the outer end of K down in position to contact with c. If, now, it be desired to use the unison, the escapement B is vibrated by pulsations in the circuit 1 l sufficiently to bring a and the end of Ktogether, the force of Ibeing,

as before stated, insufficient to attract j\ to itsel fagain. The printingcircuit i s new broken, releasing G, whose spring I) immediately throws it up, its arm 9 throwing the free end of K up and forcing its armature within effective range of I. Vhenever the escapement is stopped to permit printing, and the printing is about to be effected, the unison-leverKtends to come into action, first, because of the formation of claim, and desire to secure by Letters Patent,

1. In a printing-telcgraph, the combination of a magnet controlling the printing mechanism and amagnet controlling the unison mechanism, both located in a normally charged printing-circuit, the breaking of which permits the operation of the printing mechanism,

throwing the unison-lever out .of action and into effective range of the unison-magnet, sub stantiall y as set forth.

2. In a printing-tclcgraph, the combination of a unison-lever, a retractor tending to put the lever in action, and a magnet normally holding the same out of action, the magnet and retractor being so adjusted relatively to each other that the magnet unaided cannot draw the lever out of action, and means controlled by the printing mechanism to throw the lever within effective range of the unison-n1agnet, substantially as set forth.

3. Inaprintingtelegraph, the combination, with a normally-charged printing-circuit, of a printing-magnet and a unison-magnet, and a shnnt-circuit around the unison-magnet, controlled by the escapement mechanism, sub stantially as set forth.

This specification signed and witnessed this 15th day of February, 1883.

STEPHEN D. FIELD.

\Vitnesscs:

\VILLIAM E. SI-IINNER, JOHN B. SCOTT. 

